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J. R. WHITNEY. moonss OF AND MOLD FOR CASTING.

Patented Nov. 16, 1886.

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1 ITED STATES I PATE T] O FICE.

JOHN HwHITNEY, or RADNOR, DELAWARE coUNTY, PENNSYLVANIA.

sooess OF ANDMOLD FOR- CASTING.

SPECIFICATION forming part of Letters Patent No. 352,792, dated November 16 1886.

Application filed J annary 2, 1886. Serial No. 187,452. (No model.)

ful Improvements in Casting Metals, of which the following is a specification.

7 My invention relates to the construction of such castings as it is desirable to make in sections or with spaces between different parts too thin to be produced by the use of ordinary sand cores. castings, but is designed to be applied especially tolthe manufacture of chills for railroadcar wheels,when it is required that they should be cut into sections on their inner surface, to allow them to freely expand and contract in the process of casting a wheel. Ordinarily for articles of this character a solid casting is first made, and after it is properly shaped to its required dimensions it is divided into the required sections by sawing through the metal at the desired points--an operation which involves considerable expense and labor. By my improvement such expense and labor are avoided, the chill being cut into sections by the.

process of casting, with intervening spaces between the sections no greater than saw-kerfs, and, if desired,'very much less. To accomplish this I use thin blades or plates of asbestus pa per, mica, or other equally refractory thin material,alone or in combination with sheet-iron or other stiffening material. These are placed in those positions in the mold'where the'parts of the casting should be separated from each other, and thus serve to prevent the molten metal from flowing together. Asbestus paper, or felt alone, or card-board, mica, sheet-iron, &c., with a coating of asbestos, are found so refractory that they effectually resist the action of the molten metal, and cores may thus be made extremely thin, so that the different sections may be cast in Very close proximity to each other at the edges, but without possibility of union. In using such parting plates or pieces they may be embedded in the green-sand mold so as to extend into or across the mold, where desired, or they may be secured in or project from ordinary dry-sand cores.

While my invention is adapted for use in making a great variety of articles,'I have illus- It is applicable to a great variety of.

. trated it in the drawings in connection with means of casting the chills of car-wheels, Figure 1 being a transverse sectional elevation of such means; and Fig. 2, a sectional plan on the line 1 2, Fig. 1. Fig. 3 is a section showing a modification. Fig. 4 is a side View of a dry-sand core supporting a thin blade of carbonized fiber or asbestus.

A represents the casting, B the sand, and a the plates or blades of refractory materiaharranged at the points where the casting must be divided, the whole being shown in a two-part flask resting on a bottom board.

Itwill of course be understood that where minute slits or openings of irregular form are spond to the form and position of the openings required, the core, as usual, being put in place after the pattern is withdrawn from the sand.

In Fig. 3 the blade at is shown extending from the sand at one side of the moldi nto a cylindrical core, so as to constitute a core for forming in the casting an opening communicating with a slit extending to one side.

It should be understood that the iron or cardboard is merely the support of the refractory material which protects the supporting-blade from the effects of the molten metal. It should also he understood that underthehead of thin blades of refractory material I include carbonized cloth, thin plates of clay, and other refractory substances.

In Fig. 4 the blade of asbestos, carbonized paper, or other material is shown as secured in a dry-sand core, the latter constituting a frame supporting the blade, except at the point where the slot is to be situated.

I do not here claim supporting a thin core in a frame or at the edges, as this forms the subject of aseparate application for Letters Patent filed July 26, 1886, Serial No. 209,136.

\Vithout limiting myself to any special time pouring the molten metal into the sections, substantially as set forth.

2. The combination, with a mold for casting chill-molds for car-wheels, 850., of thin blocks or blades of asbestos or other refractory mate- 4. The combination, with a mold for casting chill-molds for car-wheels, of thin plates or blades consisting, in Whole or in part, of asbestus or other equally refractory thin material embedded in a dry-sand core or frame and 20 placed in the mold, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two sub scribing witnesses."

JOHN R. XVHITN EY.

Vitnesses:

WM. A. BEDDING, HENRY RAINEY. 

